Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce4ec854ab22ffe…

MALICIOUS

PDF

80.9 KB Created: 2021-04-04 11:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: dc4e814c1860f3a2373f6e1735d1b068 SHA-1: e314432420468bfd15250974131347e3d862f9b6 SHA-256: dce4ec854ab22ffe7bba1f99b8681a2443385d8a59e73649bd3236bda3d2145b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable hosting, characteristic of a link farm. The embedded text 'Wavelet matlab pdf' suggests a lure to attract users interested in technical topics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/award?keyword=wavelet+matlab+pdf PDF link annotation
    • https://cdn.sqhk.co/zofizitene/gdEhfhg/13618699620.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382413/normal_5ff2b9fded329.pdfIn PDF document text
    • https://cdn.sqhk.co/japuwejede/ijoig6A/sovozifubaj.pdfIn PDF document text
    • https://baliwiwun.weebly.com/uploads/1/3/1/3/131380001/6326973.pdfIn PDF document text
    • https://cdn.sqhk.co/pijavagoke/RviiigI/amazon_prime_day_tv_deals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481821/normal_6058ea337eac7.pdfIn PDF document text
    • https://falobulavogibe.weebly.com/uploads/1/3/4/6/134662271/48e071d849e0a9.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/Mg28jeM/detective_baldy_sniper_game.pdfIn PDF document text
    • https://munerojepoges.weebly.com/uploads/1/3/4/0/134042508/5872691.pdfIn PDF document text
    • https://cdn.sqhk.co/rezeribevi/fibhjhj/notes_from_underground_quotes.pdfIn PDF document text
    • https://nugiwilog.weebly.com/uploads/1/3/1/3/131384260/924696.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_3e0613c3d2ee4aeab00cd529987b93a0.pdf?index=trueIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_bee5864c79b94417bcb6e7a94bd3ef2d.pdf?index=trueIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_1e03bcdb8a8b497eb26734a4a055f0d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c90f652-be19-403e-9185-7abaf3c960f1/shimano_ultegra_di2_brake_lever_hoods.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/oneplus_file_manager_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/dolibuxuxibi.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/gleadell_market_report.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/united_states_military_insignia.pdfIn PDF document text
    • https://d85b1738-a471-4043-b59e-116b2bb794a3.filesusr.com/ugd/97927e_e6a8b0e868e74abb97a3b0ad33760e5c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f9be708-a6cc-4d18-ade0-6dfec3434a9f/what_is_the_best_folding_knife_for_self_defense.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_1978c70ae92d47e9a795bc1015797e6d.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 5128 bytes
SHA-256: fb47cdbfe402db9baf86c47b6616e06f7711be89a813cd7c522a4b578ed77122
font_01_sfnt_off000112f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F8 10192 bytes
SHA-256: 0c26f45c4cbdb702b0d2cc36056b078a639ec89e2a59d2807cca099366c3158e